Extracted .wav files

[ZippyEFC]

Sometimes when i have extracted the .wav file from an mpeg 3 encoded .avi file,using VirtualDub,it has become shorter than the original soundtrack,causing the sound to go out of sync on the completed dvd.Can this be rectified in TMPGEnc or am i using VirtualDub incorrectly?Can anybody help me with this please?

Thanks.

On the attached file the extracted .wav file finishes 4 seconds before the .avi file.

[benderman]

Maybe the sound starts later than the video. That means that there are a few seconds of silence at the beginning of the video. This may happen depending on the encoding-method. If you save the set the audio-mode to direct-stream-copy and save the wav, you get the original audio (mp3-file with wav-extension) but you lost the information where the audio startes and so it's out of sync. Maybe you can prevent this if you use full-processing-mode for the audio, convert it to plain wav (no compression) and save as wav. Than VD should append some zero-samples at the beginning, so that audio and video start at the same time.

[ZippyEFC]

I did extract the .wav using full processing mode.The sound is in sync at the start of the film,but goes out of sync during playback,the further into the film you go the more out of sync it becomes.Any suggestions?

[benderman]

Then it seems to be a badly encoded avi-file. Maybe it's VBR-MP3-audio or encoded with lame software. Only help I can give you is to gat the latest Version of VirtualDUB, TMPEGEnc or NanDUB and try again. Else you will have to stretch the audio manually (newest VirtualDub or many audio-editors can do that), so it fits the video.